Angular Diameters and Effective Temperatures of Twenty-five K Giant Stars from the CHARA Array

Abstract

Using Georgia State University's CHARA Array interferometer, we measured angular diameters for 25 giant stars, six of which host exoplanets. The combination of these measurements and Hipparcos parallaxes produce physical linear radii for the sample. Except for two outliers, our values match angular diameters and physical radii estimated using photometric methods to within the associated errors with the advantage that our uncertainties are significantly lower. We also calculated the effective temperatures for the stars using the newly-measured diameters. Our values do not match those derived from spectroscopic observations as well, perhaps due to the inherent properties of the methods used or because of a missing source of extinction in the stellar models that would affect the spectroscopic temperatures.

References in corpus (10)

• Basic physical parameters of a selected sample of evolved stars
• Retired A Stars and Their Companions II: Jovian planets orbiting kappa Coronae Borealis and HD167042
• Solar-like oscillations in the G8 V star tau Ceti
• Discovery of a planet around the K giant star 4 UMa
• A Planet in a 0.6-AU Orbit Around the K0 Giant HD 102272
• Planetary companions around the K giant stars 11 UMi and HD 32518
• Solar-like oscillations in the metal-poor subgiant nu Indi: constraining the mass and age using asteroseismology
• Planetary companion candidates around the K giant stars 42 Dra and HD 139357
• The Discovery of Stellar Oscillations in the Planet Hosting Giant Star Beta Geminorum
• Fundamental Parameters of the Exoplanet Host K Giant Star iota Draconis from the CHARA Array

Cited by in corpus (35)

• Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer
• A Guide to Realistic Uncertainties on Fundamental Properties of Solar-Type Exoplanet Host Stars
• Pseudomagnitudes and Differential Surface Brightness: Application to the apparent diameter of stars
• "Retired" Planet Hosts: Not So Massive, Maybe Just Portly After Lunch
• Empirical metallicity-dependent calibrations of effective temperature against colours for dwarfs and giants based on interferometric data
• Radii, masses, and ages of 18 bright stars using interferometry and new estimations of exoplanetary parameters
• Predicting Stellar Angular Diameters from $V$, $I_C$, $H$, $K$ Photometry
• Interferometric diameters of five evolved intermediate-mass planet-hosting stars measured with PAVO at the CHARA Array
• Three-dimensional hydrodynamical simulations of red giant stars: semi-global models for the interpretation of interferometric observations
• A new interferometric study of four exoplanet host stars : θ Cygni, 14 Andromedae, {\upsilon} Andromedae and 42 Draconis
• The Sizes of the Nearest Young Stars
• Variations in the Na-O anticorrelation in globular clusters: Evidence for a deep mixing episode in red giant branch stars
• Transiting exoplanets from the CoRoT space mission XXI. CoRoT-19b: A low density planet orbiting an old inactive F9V-star
• The Penn State-Torun Centre for Astronomy Planet Search stars. I. Spectroscopic analysis of 348 red giants
• Fundamental properties of red-clump stars from long-baseline H-band interferometry
• Ruling Out Possible Secondary Stars to Exoplanet Host Stars Using the CHARA Array
• Revised extinctions and radii for 1.5 million stars observed by APOGEE, GALAH, and RAVE
• On the metallicity distribution of the peculiar globular cluster M22
• A Catalog of Calibrator Stars for Next-Generation Optical Interferometers
• Atmospheric composition of weak G band stars: CNO and Li abundances
• Direct measurement of stellar angular diameters by the VERITAS Cherenkov Telescopes
• Chromospheric Thermal Continuum Millimetre Emission from non-dusty K and M Red Giants
• HD-TESS: An Asteroseismic Catalog of Bright Red Giants within TESS Continuous Viewing Zones
• Precise calibration of the dependence of surface brightness-colour relations on colour and class for late-type stars
• Chromosphere of K giant stars Geometrical extent and spatial structure detection
• Direct Measurements of Giant Star Effective Temperatures and Linear Radii: Calibration Against Spectral Types and V-K Color
• Angular Diameters and Fundamental Parameters of Forty-Four Stars from the Navy Precision Optical Interferometer
• From the stellar properties of HD219134 to the internal compositions of its transiting exoplanets
• Modeling the near-UV band of GK stars, Paper II: NLTE models
• Spectroscopic and Interferometric Measurements of Nine K Giant Stars
• Asymmetries on red giant branch surfaces from CHARA/MIRC optical interferometry
• Herschel-PACS photometry of faint stars
• The long history of the Rossiter-McLaughlin effect and its recent applications
• PTPS Candidate Exoplanet Host Star Radii Determination with CHARA Array
• Modeling the near-UV band of GK stars, Paper III: Dependence on abundance pattern